|  | 6.3 | Standard ACLs
| 6.3.4 | What are standard ACLs

In this example, the ACL allows only traffic from source network 172.16.0.0 to be forwarded. Non-172.16.0.0 network traffic is blocked. The example shows how the ACL allows only traffic from source network 172.16.0.0 to be forwarded and non-172.16.0.0 to be blocked. Also shown in the example, the command ip access-group 1 out groups the ACL to an outgoing interface. Permitting Traffic from Source Network 172.16.0.0 access-list 1 permit 172.16.0.0 0.0.255.255 (implicit deny any - not visible in the list) (access-list 1 deny 0.0.0.0 255.255.255.255) interface ethernet 0 ip access-group 1 out interface ethernet 1 ip access-group 1 out